J. Schieck
A5087831201- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Computational Physics and Python Applications
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Distributed and Parallel Computing Systems
- CCD and CMOS Imaging Sensors
- Superconducting and THz Device Technology
- advanced mathematical theories
- Nuclear physics research studies
- Scientific Research and Discoveries
- Muon and positron interactions and applications
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Advanced Data Storage Technologies
- International Science and Diplomacy
Institute of High Energy Physics
2016-2025
University of Antwerp
2023-2025
TU Wien
2016-2025
A. Alikhanyan National Laboratory
2016-2024
Austrian Academy of Sciences
2015-2023
Campbell Collaboration
2001-2023
Max Planck Innovation
2004-2020
Max Planck Society
2004-2020
Excellence Cluster Universe
2012-2017
Technical University of Munich
2017
The CMS apparatus was identified, a few years before the start of LHC operation at CERN, to feature properties well suited particle-flow (PF) reconstruction: highly-segmented tracker, fine-grained electromagnetic calorimeter, hermetic hadron strong magnetic field, and an excellent muon spectrometer. A fully-fledged PF reconstruction algorithm tuned detector therefore developed has been consistently used in physics analyses for first time collider. For each collision, comprehensive list...
This paper describes the CMS trigger system and its performance during Run 1 of LHC. The consists two levels designed to select events potential physics interest from a GHz (MHz) interaction rate proton-proton (heavy ion) collisions. first level is implemented in hardware, selects containing detector signals consistent with an electron, photon, muon, τ lepton, jet, or missing transverse energy. A programmable menu up 128 object-based algorithms used for subsequent processing. thresholds are...
New sets of parameters (“tunes”) for the underlying-event (UE) modelling pythia8, pythia6 and herwig++ Monte Carlo event generators are constructed using different parton distribution functions. Combined fits to CMS UE proton–proton ( $$\mathrm {p}\mathrm {p}$$ ) data at $$\sqrt{s} = 7\,\text {TeV} $$ proton–antiproton {p}\overline{\mathrm{p}} from CDF experiment lower $$\sqrt{s}$$ , used study models constrain their parameters, providing thereby improved predictions collisions 13 $$\,\text...
Many measurements and searches for physics beyond the standard model at LHC rely on efficient identification of heavy-flavour jets, i.e. jets originating from bottom or charm quarks. In this paper, discriminating variables algorithms used jet during first years operation CMS experiment in proton-proton collisions a centre-of-mass energy 13 TeV, are presented. Heavy-flavour have been improved compared to those previously energies 7 8 TeV. For with transverse momenta range expected simulated...
Improved jet energy scale corrections, based on a data sample corresponding to an integrated luminosity of 19.7 inverse-femtobarns collected by the CMS experiment in proton-proton collisions at center-of-mass 8 TeV, are presented. The corrections as function pseudorapidity eta and transverse momentum pT extracted from simulated events combining several channels methods. They account successively for effects pileup, uniformity detector response, residual data-simulation differences. Further...
Combined measurements of the production and decay rates Higgs boson, as well its couplings to vector bosons fermions, are presented. The analysis uses LHC proton-proton collision data set recorded with CMS detector in 2016 at $\sqrt{s} =$ 13 TeV, corresponding an integrated luminosity 35.9 fb$^{-1}$. combination is based on analyses targeting five main boson mechanisms (gluon fusion, associated a W or Z top quark-antiquark pair) following modes: H $\to$ $\gamma\gamma$, ZZ, WW, $\tau\tau$,...
The CRESST experiment is a direct dark matter search which aims to measure interactions of potential particles in an earth-bound detector. With the current stage, CRESST-III, we focus on low energy threshold for increased sensitivity towards light particles. In this manuscript describe analysis one detector operated first run CRESST-III (05/2016-02/2018) achieving nuclear recoil 30.1eV. This result was obtained with 23.6g CaWO$_4$ crystal as cryogenic scintillating calorimeter setup at...
The CRESST-II experiment uses cryogenic detectors to search for nuclear recoil events induced by the elastic scattering of dark matter particles in CaWO$_4$ crystals. Given low energy threshold our combination with light target nuclei, mass can be probed high sensitivity. In this letter we present results from data a single detector module corresponding 52 kg live days. A blind analysis is carried out. With an recoils 307 eV substantially enhance sensitivity matter. Thereby, extend reach...
The CMS muon detector system, reconstruction software, and high-level trigger underwent significant changes in 2013-2014 preparation for running at higher LHC collision energy instantaneous luminosity. performance of the modified system is studied using proton-proton data center-of-mass $\sqrt{s}=$ 13 TeV, collected 2015 2016. measured parameters, including spatial resolution, efficiency, timing, are found to meet all design specifications well reproduced by simulation. Despite more...
Measurements of two- and multi-particle angular correlations in pp collisions at sqrt(s) = 5, 7, 13 TeV are presented as a function charged-particle multiplicity. The data, corresponding to integrated luminosities 1.0 inverse picobarn (5 TeV), 6.2 picobarns (7 0.7 (13 were collected using the CMS detector LHC. second-order (v[2]) third-order (v[3]) azimuthal anisotropy harmonics unidentified charged particles, well v[2] K0 short Lambda/anti-Lambda extracted from long-range two-particle...
New sets of CMS underlying-event parameters ("tunes") are presented for the PYTHIA8 event generator. These tunes use NNPDF3.1 parton distribution functions (PDFs) at leading (LO), next-to-leading (NLO), or next-to-next-to-leading (NNLO) orders in perturbative quantum chromodynamics, and strong coupling evolution LO NLO. Measurements charged-particle multiplicity transverse momentum densities various hadron collision energies fit simultaneously to determine tunes. Comparisons predictions new...
The observation of the standard model (SM) Higgs boson decay to a pair bottom quarks is presented. main contribution this result from processes in which bosons are produced association with W or Z (VH), and searched for final states including 0, 1, 2 charged leptons two identified quark jets. results measurement these data sample recorded by CMS experiment 2017, comprising 41.3 fb$^{-1}$ proton-proton collisions at $\sqrt{s} =$ 13 TeV, described. When combined previous VH measurements using...
In July 2012, the ATLAS and CMS collaborations at CERN Large Hadron Collider announced observation of a Higgs boson mass around 125 gigaelectronvolts. Ten years later, with data corresponding to production 30-times larger number bosons, we have learnt much more about properties boson. The experiment has observed in numerous fermionic bosonic decay channels, established its spin-parity quantum numbers, determined measured cross-sections various modes. Here Collaboration reports most...
A search for invisible decays of a Higgs boson is performed using proton-proton collision data collected with the CMS detector at LHC in 2016 center-of-mass energy , corresponding to an integrated luminosity 35.9. The targets production via vector fusion. are found be agreement background contributions from standard model processes. An observed (expected) upper limit 0.33 (0.25), 95% confidence level, placed on branching fraction decay particles, assuming rates and mass 125.09 GeV. Results...
A bstract Properties of the Higgs boson are measured in H → ZZ 4ℓ (ℓ = e, μ ) decay channel. data sample proton-proton collisions at $$ \sqrt{s}=13 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:mi>s</mml:mi></mml:msqrt><mml:mo>=</mml:mo><mml:mn>13</mml:mn></mml:math> TeV, collected with CMS detector LHC and corresponding to an integrated luminosity 35.9 fb −1 is used. The signal strength modifier , defined as ratio observed rate channel standard model expectation,...
The measurement of the luminosity recorded by CMS detector installed at LHC interaction point 5, using proton-proton collisions s=13TeV in 2015 and 2016, is reported. absolute scale measured for individual bunch crossings beam-separation scans (the van der Meer method), with a relative precision 1.3 1.0% respectively. dominant sources uncertainty are related to residual differences between beam positions ones provided operational settings magnets, factorizability proton spatial density...
At the start of Run 2 in 2015, LHC delivered proton-proton collisions at a center-of-mass energy 13 TeV. During (years 2015-2018) eventually reached luminosity 2.1 $\times$ 10$^{34}$ cm$^{-2}$ s$^{-1}$, almost three times that during 1 (2009-2013) and factor two larger than design value, leading to events with up mean about 50 simultaneous inelastic per bunch crossing (pileup). The CMS Level-1 trigger was upgraded prior 2016 improve selection physics challenging conditions posed by second...
A measurement of the coupling strength Higgs boson to a pair tau leptons is performed using events recorded in proton-proton collisions by CMS experiment at LHC 2016 center-of-mass energy 13 TeV. The data set corresponds an integrated luminosity 35.9 inverse femtobarns. H signal established with significance 4.9 standard deviations, be compared expected 4.7 deviations. best fit product observed production cross section and branching fraction 1.09 +0.27-0.26 times model expectation....
The performance of missing transverse momentum (Tmiss) reconstruction algorithms for the CMS experiment is presented, using proton-proton collisions at a center-of-mass energy 13 TeV, collected CERN LHC in 2016. data sample corresponds to an integrated luminosity 35.9 fb-1. results include measurements scale and resolution Tmiss, detailed studies events identified with anomalous Tmiss. presented Tmiss algorithm that mitigates effects multiple interactions, "pileup per particle...
The CRESST-II cryogenic dark matter search aims for the detection of WIMPs via elastic scattering off nuclei in CaWO $$_4$$ crystals. We present results from a low-threshold analysis single upgraded detector module. This module efficiently vetoes low energy backgrounds induced by $$\alpha $$ -decays on inner surfaces detector. With an exposure 29.35 kg live days collected 2013 we set limit spin-independent WIMP-nucleon which probes new region parameter space WIMP masses below 3 GeV/c $$^2$$...
A search for a heavy Higgs boson in the H to WW and ZZ decay channels is reported. The based upon proton-proton collision data samples corresponding an integrated luminosity of up 5.1 inverse femtobarns at sqrt(s) = 7 TeV 19.7 8 TeV, recorded by CMS experiment CERN LHC. Several final states decays are analyzed. combined upper limit 95% confidence level on product cross section branching fraction exclude with standard model-like couplings range 145 < m[H] 1000 GeV. We also interpret results...
The spectra of charged particles produced within the pseudorapidity window |η| < 1 at $$ \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5.02 TeV are measured using 404 μb−1 PbPb and 27.4 pb−1 pp data collected by CMS detector LHC in 2015. presented over transverse momentum ranges spanning 0.5 p T 400 GeV 0.7 collisions. corresponding nuclear modification factor, R AA, is bins collision centrality. AA 5% most central collisions shows a maximal suppression factor 7-8 region 6-9 GeV. This dip followed an...
Results on two-particle angular correlations for charged particles produced in pp collisions at a center-of-mass energy of 13 TeV are presented. The data were taken with the CMS detector LHC and correspond to an integrated luminosity about 270 inverse nanobarns. studied over broad range pseudorapidity (abs(eta) < 2.4) full azimuth (phi) as function particle multiplicity transverse momentum (pt). In high-multiplicity events, long-range (abs(Delta eta) > 2.0), near-side (Delta phi...
A measurement of the inelastic proton-proton cross section with CMS detector at a center-of-mass energy $\sqrt{s} =$ 13 TeV is presented. The analysis based on events deposits in forward calorimeters, which cover pseudorapidities -6.6 $< \eta <$ -3.0 and +3.0 +5.2. An 68.6 $\pm$ 0.5 (syst) 1.6 (lumi) mb obtained for $M_\mathrm{X} >$ 4.1 GeV and/or $M_\mathrm{Y} GeV, where $M_\mathrm{X}$ $M_\mathrm{Y}$ are masses diffractive dissociation systems negative positive pseudorapidities,...
A systematic study of the factorization long-range azimuthal two-particle correlations into a product single-particle anisotropies is presented as function pt and eta both particles, particle multiplicity in PbPb pPb collisions. The data were taken with CMS detector for collisions at sqrt(s[NN]) = 2.76 TeV 5.02 TeV, covering very wide range multiplicity. Factorization observed to be broken eta. When measured particles different pt, magnitude breakdown second Fourier harmonic reaches 20%...